ASN Bank was founded on May 1, 1960 by the union of Federatie Nederlandse Vakbeweging (Federation Dutch Labour Union) (FNV) and the insurance company de Centrale (now Reaal insurances). Until the 1990s it was possible to open an ASN savings account through the Postbank, which were known as 'vakbondsspaarrekeningen' (union savings accounts).

ASN Bank is currently the largest sustainability-driven bank in the Netherlands, and was elected as the second most climate-friendly bank in the Netherlands (behind Triodos Bank).